Washtrough for filters.



PATENTED AUG. 21, 1906.

E'. B. LEOPOLD. WASHTROUGH FR FILTERS.

APPLICATION FILED n00T. 27. 1905.

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PATBNTED AUG. 21, 1906.

P. B.'LEoPoLD.A WASHTRGUGH PoR FILTERS.

AIPPLIDATVION I'ILBD 00T. 27. 1905.

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WITNESSES.

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UNITED STATES PATENT OFFICE.

Specification of Letters Patent.

Patented Aug'. 21, 1906.

Application filed Getober 27, 1905. Serial No. 284,730.

T0 all whom t may concern:

Be it known that I, FREDERICK B. LEO- POLD, a resident of Evanston, in the county of Cook and State of Illinois, have invented a new and useful Improvement in VVashtroughs for Filters; and I do hereby declare the following to be a full, clear, and exact description thereof'.

My invention relates to washtrmighs for filters.

The object of my invention is to provide a trough of such character that during the washing operation the velocity of the upward flow of the wash-water will be reduced and practically freed from the eddies and counter-currents which are present in connection with the washtroughs heretofore employed and which have a tendency to retain the suspended matter longer on the filter-bed, and so require a longer application of the Wash-water to remove it, whilel at the same time the velocity of the water in its upward course acted to carry a quantity of sand with it into the trough.

To these ends myinvention comprises, generally stated, a trough having bulging or protruding walls, forming a contracted mouth, Which act to gently divert the upwardly-rising) water and compel the saine to travel in a su stantially horizontal course before flowing into said trough. y

To enable others skilled in the art to make and use my invention, I will describe the same more fully, referring to the accompanyingrdrawings, in whichigure 1 is a plan view of a filter with my invention applied thereto. Fig. 2 is a section on line 2 2, Fig. 1` Fig. 3 is a cross-section. Fig. 4 is an enlarged cross-section of trou h.

Li e numerals indicate like parts in each.

In the drawings the numeral 2 designates a section of a sand filtration plant of ordinary construction havin the inlet-pipe 3 for raw Water, the sand be( 4, the air- )ipe 5,`the airmanifold 6, the water-manifolld 7, the clearwater pipe 8, and the wash-water conduit 9.

Arranged centrally of the filter and extendin longitudinally thereof is the gutter 10, w ich carries off the dirty water and scum removed in the cleaning operation. Connected to this central gutter 10 are the troughs 11, which extend from the side walls of the filter to said gutter. These trou hs may be formed of metal plates 12 of suite le thickness, and the said plates are bent to form bulging or protruding walls, forming inclinedfaces 13 and. 14. Each trough may be formed of two plates connected by the metal straps 15 at suitable intervals and leaving a small opening 20 between said plates for the purpose fully hereinafter set forth. This trough may be made of concrete, wood, or any other suitable material. Angles 16 secure the trough to the side walls of the filter' and to the gutter-Wall 17. Angle-bars 1S, extending from the side walls to the wall 17, further brace and support said trough.

When it is desired to wash the filter-bed, the wash-water is admitted from below in thc ordinary manner, and as the water rises in the filter it agitates and washes the same. As thc water rises it is directed by the inclined faces 13 of the trough and travels up said faces without creating ed dies or countercurrents, so that the suspended matter rises quickly and withou t interference. Furthermore, owing to the faces 14 the water before entering the trough is compelled to follow a substantially horizontal course, so that the sand contained therein has an opportunity to settle before being carried into the trough. The space above the faces 14- being protected from the upward agitation or flow of the water is not disturbed to any extent, so that the water is comparatively quiet at this point, and as a consequence the grains of sand, which are heavier than the water, have opportunity to settle. As they settle they fall upon the faces 14. The water when it reaches the overflow is substantially free from any sand lifted by the agitation of the water. IVhen the washing operation ceases, as the water subsides it flows down the faces 14 and. washes any sand deposited thereon back into the filter-bed.

To further guard. against the passage of sand into the waste, I employ the opening 20, which will permit any sand entering the trough to find its way back into the filterbed.

1. A washtrough for filters or protruding walls forming and a contracted mouth.

2. A washtrough for filters having a projecting top portion eXtcndin outwardly from the mouth of said trough, wljiereby the water before entering said trough travels in a horizontal or substantially horizontal course.

3. A washtrough for filters having an inclined top portion extending from the mouth having bulging i nelined faces IOO IKO

ol' seid trough, whereby tering said trough travels in n` horizontal er l substantially horizontal course.

4. A wushtrough for filters having outwardly-projeeting top portions extending from the niouth of seid trough at both sides thereof, whereby the water hefore entering seid trough travels in a4 horizontal or substantially horizontal course.

5. A weshtrough for filters having inclined top portions extending from the mouth of said trough et both sides thereof, whereby the witter before entering said trough travels in e horizontal or substantially horizontal course.

6. A weshtrough for filters having upwardly und. outwardly inclined faces extendthe water before en- 1 ing from the bottom of seid trough to npoint and inwardly end upwardly inclined feces extending from seid point to the month oll l seid trough.

7. A weshtrough forfiltershuving un opening in the bottoni thereof lending beek into the filter.

8. A weshtrough for filters comprising metal plates connected together with n slight intervening space between their lower edges.

In testimony whereof I, the seid FREDER- 10K B. LEoPoLD, have hereunto set my hend.

FREDERUK B. LEOPOLD.

W'itnesses:

ROBERT (l. To'nrEN, J. R. KELLER. 

